I think you misread the instructions. If you're seeing what I'm looking at on my wife's ADM portal, you haven't given ADM "permission" to factory reset. You can't remote wipe or lock your phone without an app being given this permission. Go to the Google Settings app and enable the option. Additionally, go to Settings -> More -> Security -> Device Administrators and check the box for ADM. The option should then become active for remote wiping via the website.Well the wipe option on the device manager website is greyd out. The instructions say that the phone needs a factory reset in order to activate the wipe function for future use.